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Deposits - Summary of Total Deposits (Details) - USD ($)
$ in Thousands
Sep. 30, 2021
Dec. 31, 2020
Banking and Thrift, Other Disclosures [Abstract]    
Deposits - interest bearing $ 20,890,292 $ 22,664,899
Deposits - non-interest bearing 568 1,140
Total deposits $ 20,890,860 $ 22,666,039